NDLI: Photonic light trapping in self-organized all-oxide microspheroids impacts photoelectrochemical water splitting

Content Provider	Royal Society of Chemistry (RSC)
Author	Constable, Edwin C. Toth, Rita Braun, Artur Boudoire, Florent Heier, Jakob
Copyright Year	2014
Abstract	Thin films involving an oxide heterojunction are increasingly employed as electrodes for solar water splitting in photoelectrochemical cells. Hematite (α-Fe2O3) and tungsten oxide form an attractive heterojunction for this purpose. A major limitation of this strategy is the short charge carrier diffusion length in hematite. Ultra-thin films were implemented to address this low conductivity issue. Nevertheless, such ultrathin films do not absorb light efficiently. The present study explores light trapping strategies to increase the optical path length of photons in hematite. Vesicle suspensions were developed to obtain thin films composed of a microspheroid array with a tungsten oxide core and a nanometer sized hematite overlayer. This bottom-up approach allows a fine control of the spheroid dimensions at the micrometric to the submicrometric scale. Using the finite difference time domain method, light propagation inside the microstructures was quantitatively simulated. The simulation results were coupled to an analysis of the photoelectrochemical response of the films. Experiments and simulation show quantitative agreement and bring important insights into the relationship between the interaction of light with the microstructure and the photoanode performance.
Starting Page	2680
Ending Page	2688
Page Count	9
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	8
Journal	Energy & Environmental Science
DOI	10.1039/c4ee00380b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Heterojunction Water splitting Photoelectrochemical cell Hematite Tungsten oxide Charge carrier Diffusion Optical path length Nanometre Overlayer Spheroid Finite-difference time-domain method
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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